<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>叶琪</title>
    <style>
        body{
            background-image: url('img/dufu.png');
             /* background-repeat: repeat-x; */
             /* 横铺  */
            background-repeat: no-repeat ;
            background-attachment: fixed;
            background-position: center;                                                                                                                                                                                                                                                                                                                                      
        }
    </style>
</head>
<body>
    <h1>Hello World!</h1> 
</body>
</html>                                                                                                                                                                                                                                                                                               